a/c and recirc lite flashing in 89 780 bertone. Topic is solved

780 bertone · Post by **780 bertone** » 27 Jan 2007, 12:40

thank you do you have any other suggestions thank you very much for your time i guess ill get it figured out eventually i will let you know what i find.

Post by **billofdurham** » 27 Jan 2007, 15:41

This is an excerpt from the manual:

The way I read it is that if the relay is not working properly then the load on the power transistor is not being reduced. This would give a fault code of 2-3-3 (Blower motor has excessive current draw).

Bill.

780 bertone · Post by **780 bertone** » 27 Jan 2007, 15:52

does the manual by chance give the location of the relay? have had no luck finding it so far.thanks again.

Post by **billofdurham** » 27 Jan 2007, 16:17

The only relay for the 780 without a specific location is the blower relay.
However, the 740/760 use the same system and the blower relay for them is "under the right side of the dash behind the glove box".

There should be two relays there. The other is the A/C delay relay.

We'll get there if we persevere!

Bill.

780 bertone · Post by **780 bertone** » 27 Jan 2007, 18:01

removed the glove box there are no relays, there i found a box with 2 plugs it is screwed to the blower box. i removed it, it is a circuit board of some type, i called volvo with the part # they told me it was part of the heater control for a 940. cleaned it all up then going to put it back and found heater core fins plugged solid, cleaned fins put everything back together and we will try again. thinking maybe heater core temp sensor getting wrong reading, i will let you know but as for the relays i dont know where they are. thank you for your help we will figure it out eventually i guess.

780 bertone · Post by **780 bertone** » 17 Feb 2007, 17:19

ok light is flashing all the time now and blower not working,still flashing 233 code excessive current draw from blower motor cannot find blower motor relay did you have any luck finding the relay? thanks again for the help I have been busy so havent had much time to mess with it.

Post by **billofdurham** » 18 Feb 2007, 13:03

My friendly Volvo tech has confirmed that the relays for the 740/760 are behind the glove box and assumed they were for the 780. However, he has never worked on a 780. He is now wondering if Volvo, in their wisdom, put the relays in a different location on US models. I don't think so because the literature I am working from is for the US market.

The only other location we can find is:

Bill.

780 bertone · Post by **780 bertone** » 18 Feb 2007, 13:17

thank you for your help once again that is the control box i noted in my previous post, guy at volvo told me was for 940 heater control by part #. do you have any info on testing the $300.00 unit? thanks again

Post by **billofdurham** » 18 Feb 2007, 16:05

I thought that might be the case. The 9 series followed on from the 7 series and a lot of the components are the same.

Unfortunately, I have no information on testing that unit.

We have tried again to get a precise location for the relay but every reference we find for the 740, 760, 780 and 940, all of which have the same A/C system, says it is located "under the right side of the dash behind the glove box". That is definitely for US models.

Bill.